<div>
    <div class="row margin-top-lg">
        <div class="col-md-4">
            <div id="hostCpu" style="height:300px;width: 100%;"></div>
        </div>
        <div class="col-md-4">
            <div id="hostMem" style="height:300px;width: 100%;"></div>
        </div>
        <div class="col-md-4">
            <div id="hostDisk" style="height:300px;width: 100%;"></div>
        </div>
    </div>
</div>